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Knight's Mechanical Encyclopedia (ed. Knight) 3 1 Browse Search
HISTORY OF THE TOWN OF MEDFORD, Middlesex County, Massachusetts, FROM ITS FIRST SETTLEMENT, IN 1630, TO THE PRESENT TIME, 1855. (ed. Charles Brooks) 2 0 Browse Search
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Knight's Mechanical Encyclopedia (ed. Knight), D. (search)
near the ground. A droitzschka. Dro-some-ter. An instrument for measuring the quantity of dew that collects on the surface of a body exposed to the open air during the night. Weidler's instrument was a bent balance, which marked in grains the additional weight acquired by a piece of glass (or a pan) of certain dimensions, owing to the globules of dew adhering thereto; on the other end of the balance was a protected weight. Another drosometer is substantially like a raingage. Wells's drosometer was a tussock of wool weighed dry, and again after the accession of dew. Gideon on one occasion wrung out of a fleece a bowl full of water which was collected in this way. Dross. The scum, scoria, slag, or recrement resulting from the melting of metals combined with extraneous matters. Drove. 1. (Masonry.) a. A broad-edged chisel for stone-masons. Drums. b. A mode of parallel tooling by perpendicular fluting on the faces of hard stones. 2. (Hydraulic
Knight's Mechanical Encyclopedia (ed. Knight), F. (search)
flue.12, grate. 10, mantel.13, breast. 11, back.14, damper. The earliest example of a fireplace cited in this work is that of Coninsborough Castle, in England, of the Anglo-Norman period. The mantels are constructed of flat arches. The example is adduced to show the earlier form of chimney, and perhaps the most ancient one in existence, anticipating by several centuries the first chimneys erected in Italy. (See chimney.) The fireplace (A, Fig 1996) in the hall of Vicar's Close, Wells, England, is an example of the fireplace of some centuries back. Fireplaces Louis Savot, of the Faculty of Medicine at Paris (1579-1640), published a work on warming and ventilation in 1624. His is the first recorded attempt at combining the cheerfulness of an open fire with the economy of an inclosed stove. Fig. B shows a front view and an elevation of his ingenious arrangement. The hearth, covings, and back were lined with thick iron plates three inches distant from the masonry. Air